crop factor on older lenses

Started Jun 6, 2014 | Questions thread
yonsito Regular Member • Posts: 134
Re: crop factor on older lenses

mbower wrote:

Ok, my next question -

I understand crop factor and that my 45mm lens is equivalent to a 90mm lens in the 35mm world.

But how do I calculate the crop factor for an older lens? I have the adaptor that lets me attach my Nikon 35mm prime to my M43s body.

What is the general crop factor that should be applied when one uses older lenses?

TIA

The crop factor depends on the size of the camera sensor, compared to a 35mm film. The lenses have nothing to do with it.

The focal length is an optical characteristic of the lens. The Olympus 45mm should always be a 45mm lens. Your Nikon 35mm is also always a 35mm lens.

The crop factor tells you what the field of view of a lens on your camera will be. The lens perspective, however, remains the same. This is important and it's why I don't think you should consider your 45mm lens a 90mm lens.

Good explanation of the crop factor:

http://www.photozone.de/sensor-dimensions

Good explanation of lens perspective:

http://www.photozone.de/focal-length-and-perspective

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